Simulation Analysis And Experimental Research On Folding-Wing Aircraft

According to different flight environments,folding wing aircraft can alter the aerodynamic shape of the wings to meet the requirements of multiple missions.During flight,the changes the wing configuration,structural flexibility deformation,and aerodynamic inter-coupling of the folding wing aircraft can significantly affect the flight stability and operability.Therefore,it is essential to study the dynamic simulation and experimental of folding wing aircraft.The main research content of the dissertation is as follows.Two types of folding mechanisms for folding wing aircraft are proposed,and the kinematic equations are established.The overall design parameters of the aircraft are developed,the wing type is selected,and the folding wing aircraft is designed and modeled using 3D modeling software.Motion simulation analysis is performed to analyze and verify the rationality of the structural design.The strength calibration of the load-bearing structure is carried out using ANSYS.The 3D model of the folding wing aircraft is simplified,aerodynamic simulation analysis is performed based on CFD,and aerodynamic data and pressure clouds are obtained for different folding angle models under different angles of attack.The aerodynamic data are plotted into aerodynamic curves and aerodynamic surfaces to analyze the changes in aerodynamic characteristics of the aircraft during the folding and unfolding process.The aerodynamic data were fitted by MATLAB to obtain the aerodynamic model of the folding wing aircraft including the folding angle.A simulation platform is built to analyze the dynamic folding and unfolding process of the folding wing aircraft by rigid-flexible aerodynamic coupling simulation.The pressure cloud diagram of the fluid field and wing profile pressure curve of the folding wing aircraft are analyzed to obtain the change in the aerodynamic characteristics of the aircraft during the folding and unfolding process.The strain cloud,stress cloud,and deformation cloud of the folded wing are analyzed to research the structural response characteristics of the wing and the rigid-flexible aerodynamic coupling effect caused by changes in the fluid field.Making prototype models of two folding wing aircraft,ground experiments are conducted on the prototype models to obtain motion parameters during the folding and unfolding process,and the natural frequencies at different folding angles are obtained through structural vibration experiments.Based on the data collected by PIXHAWK,test flight tests were carried out to observe the motion pattern and flight altitude variation curve of the aircraft,and to compare and verify the aerodynamic simulation results.